Vacuum cleaner



FIG. 1 is a top, front and left side perspective view of a head of a vacuum cleaner showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a top, front and left side perspective view of a second embodiment thereof;

FIG. 8 is a top plan view of FIG. 7;

FIG. 9 is a front elevation view of FIG. 7;

FIG. 10 is a right side elevation view of FIG. 7;

FIG. 11 is a rear elevation view of FIG. 7; and,

FIG. 12 is a left side elevation view of FIG. 7.

The details shown in broken lines form no part of the claimed design. 

The ornamental design for a vacuum cleaner, as shown and described. 